Python Tutorial ( PDFDrive )

Next, call the accept method of the returned object. This method waits until a client connects to the port you
specified and then returns a connection object that represents the connection to that client.
#!/usr/bin/python
import socket
# This is server.py file
# Import socket module
s = socket.socket()
# Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345
# Reserve a port for your service.
s.bind((host, port)) # Bind to the port
s.listen(5)
# Now wait for client connection.
while True:
c, addr = s.accept() # Establish connection with client.
print 'Got connection from', addr
c.send('Thank you for connecting')
c.close()
# Close the connection
A Simple Client:
Now, we will write a very simple client program, which will open a connection to a given port 12345 and given
host. This is very simple to create a socket client using Python's socket module function.
The socket.connect(hosname, port ) opens a TCP connection to hostname on the port. Once you have a
socket open, you can read from it like any IO object. When done, remember to close it, as you would close a file.
The following code is a very simple client that connects to a given host and port, reads any available data from
the socket, and then exits:
#!/usr/bin/python
import socket
# This is client.py file
# Import socket module
s = socket.socket()
# Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345
# Reserve a port for your service.
s.connect((host, port))
print s.recv(1024)
s.close
# Close the socket when done
Now, run this server.py in background and then run above client.py to see the result.
# Following would start a server in background.
$ python server.py &
# Once server is started run client as follows:
$ python client.py
This would produce the following result:
Got connection from ('127.0.0.1', 48437)
Thank you for connecting
Python Internet modules
A list of some important modules, which could be used in Python Network/Internet programming.
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